Why does my computer power supply not have 5 Volts

why does my computer power supply show 3 volts and 12 volts but not 5 volts?
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  1. don't know and you posted in the wrong section.

    There should be a 5 volt lead since the hard drive uses both 5v and 12v.
  2. This topic has been moved from the section Computer Peripherals to section Systems by Fihart
  3. You must be referring to the -5V rail. That rail is obsolete. It was used by some AT expansion cards way back when. Very few PSUs have it any more, and those that do I would not trust to be of sufficient quality to power a modern PC.
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